1. Click the -icon top left in the Chrome address bar.
2. In the Flash dropdown, select 'Always Allow ..'
3. Refresh the page.

Boxhead 2

Collect weapons, powerups and multiplier and kill as many zombies as you can. Everey kill will increase the multiplier by 1. Control your character with arrow keys, shoot with space and choose a weapon with 1 to 4. Don't forget the first rule of Boxhead 2: upgrade, upgrade, upgrade! :-)